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Cheap flights from Idaho to London from £251

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 14/3. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — LON
20 12月 — 27 12月1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Idaho to London

Keep the following information in mind while searching for Idaho to London flight deals. Data was last updated 20 11月 2025.

Round-trip from

£467

One-way from

£251

Popular in

June

Cheapest in

October

Average price

£741
Lufthansa
  • Lufthansa
  • 13/1-27/1
  • 3 total stops
  • 35h 12m total
  • Idaho to London
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14/3
  • 14/3
  • 3 total stops
  • 35h 53m total
  • Idaho to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£164 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
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Find flight deals from Idaho to London

Enter your travel dates to find the best prices.

Cheapest flights from Idaho to London
Explore the most affordable flight options available from Idaho to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 11月 2025.

週一 1/1206:00GEG - LHR
1 stop22h 00mUnited Airlines
週二 9/1206:35LHR - GEG
2 stops20h 09mUnited Airlines
Deal found 17/11£471
週三 10/1209:25GEG - LHR
1 stop17h 05mDelta
週三 14/106:30LHR - GEG
2 stops25h 38mDelta
Deal found 16/11£472
週一 29/1216:00GEG - LHR
1 stop33h 40mUnited Airlines
週五 9/111:10LHR - GEG
2 stops36h 11mUnited Airlines
Deal found 19/11£484
週三 10/1209:50GEG - LHR
1 stop16h 10mKLM
週三 14/110:45LHR - GEG
1 stop13h 30mKLM
Deal found 16/11£492
週日 23/1111:42BOI - LHR
1 stop15h 48mVirgin Atlantic
週二 2/1214:45LHR - BOI
1 stop14h 31mVirgin Atlantic
Deal found 17/11£494
週一 1/1206:05GEG - LHR
1 stop17h 00mKLM
週二 9/1210:45LHR - GEG
1 stop15h 52mKLM
Deal found 17/11£494
週五 5/1214:45IDA - LHR
1 stop11h 55mUnited Airlines
週二 9/1206:35LHR - IDA
2 stops21h 37mUnited Airlines
Deal found 17/11£509
週五 5/1212:16BOI - LHR
1 stop15h 59mUnited Airlines
週二 9/1206:35LHR - BOI
2 stops18h 32mUnited Airlines
Deal found 17/11£509
週四 27/1105:10GEG - LHR
1 stop20h 30mUnited Airlines
週四 4/1206:35LHR - GEG
2 stops38h 10mUnited Airlines
Deal found 17/11£509
週五 5/1212:17LWS - LHR
1 stop13h 43mDelta
週二 9/1208:40LHR - LWS
2 stops58h 57mDelta
Deal found 17/11£510
週四 27/1106:00GEG - LHR
2 stops24h 45mLufthansa
週四 4/1207:40LHR - GEG
2 stops21h 19mLufthansa
Deal found 17/11£510
週五 5/1213:17IDA - LHR
1 stop13h 43mDelta
週二 9/1210:45LHR - IDA
1 stop18h 36mDelta
Deal found 17/11£532

Cheapflights Fare Finder

 
Customise your flight search to find flights from Idaho to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 20 11月 2025.
Use the filters below to find and compare flights from Idaho to London that are best for you.

Fly from

Idaho

Fly to

London

Route

Depart

Return

Price

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

週三 14/1

12:19-11:15

1 stop15h 56m

London Heathrow

週四 22/1

06:35-18:07

2 stops18h 32m

£467

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週三 10/12

09:25-10:30

1 stop17h 05m

London Heathrow

週三 14/1

06:30-00:08

2 stops25h 38m

£472

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

週二 17/2

17:10-09:40

1 stop33h 30m

London Heathrow

週二 24/2

11:10-23:23

2 stops19h 13m

£478

BoiseLondon

BOI - LHR

BOILHR

Boise Air Term. Gowen Fld

週二 13/1

08:15-07:55

1 stop16h 40m

London Heathrow

週二 27/1

06:35-18:07

2 stops18h 32m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週二 24/2

07:00-07:25

1 stop16h 25m

London Heathrow

週二 10/3

06:35-21:18

2 stops21h 43m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週二 17/2

07:00-05:55

1 stop14h 55m

London Heathrow

週三 4/3

06:35-21:07

2 stops22h 32m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週日 15/2

07:00-05:55

1 stop14h 55m

London Heathrow

週二 3/3

06:35-18:03

2 stops19h 28m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週五 16/1

05:00-07:10

2 stops18h 10m

London Heathrow

週二 20/1

06:35-21:22

2 stops22h 47m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週一 5/1

11:25-12:50

1 stop17h 25m

London Heathrow

週一 19/1

06:30-15:00

2 stops16h 30m

£478

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

週一 16/2

11:19-12:50

1 stop17h 31m

London Heathrow

週三 4/3

06:30-14:57

2 stops16h 27m

£478

Flights are sorted by cheapest return flights first.

Deals found on 18/11

Showing 1-10 of 60 results
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Best time to book a flight from Idaho to London

Have a flexible travel schedule? Discover the best time to fly to London from Idaho with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to London

What is the cheapest month to book a flight from Idaho to London?

Currently, July is the cheapest month in which you can book a flight from Idaho to London (average of £466). Flying from Idaho to London in June is currently the most expensive (average of £828). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ID to LON?

Find hourly flight availability from Idaho to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 11月 2025.

A simple way to save on the total cost of your ticket is to fly from Idaho to London in the evening. If you’re flexible enough to do this you can expect to save up to 55% on your trip compared to booking a flight at midday.

Related info for your journey

Find useful and relevant information for your journey from Idaho to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Idaho to London?

    A quick flight from Idaho to London can take about 15h 56m. Lufthansa provides one of the quickest options available for as low as £467. The distance from Idaho to London is about 4829 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Idaho to London one-way?

    The cheapest airline one-way is Lufthansa, with whom users have recently found tickets for as low as £291. However, be on the lookout for offers from Virgin Atlantic and United Airlines, as they are both options that can get you from Idaho to London for a low price.

  • What are the most popular routes from Idaho to London?

    While some choose either Boise Air Term. Gowen Fld - London Heathrow or Spokane - London Gatwick, Spokane - London Heathrow is the most popular route from Idaho to London.

  • Can I find deals for flights from Idaho to London that include hotel bookings?

    Yes. In addition to deals on Idaho to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Idaho to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to London.

  • Can I find deals for business class flights from Idaho to London?

    Yes. Cheapflights offers flight deals from Idaho to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Idaho to London?

    Currently, July is the cheapest month in which you can book a flight from Idaho to London (average of £466). Flying from Idaho to London in June is currently the most expensive (average of £828). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Croydon
Slough
Gatwick
Hounslow
Luton
Ilford
Wembley
Deal
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Alternative routes for Idaho to London

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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How does Cheapflights help users find flights from Idaho to London?

When you search for this flight from Idaho to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Idaho to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Idaho to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Idaho to London flexibly with Cheapflights today.

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